YONDER ALONSO, PADRES
Alonso, 24, "kept hitting, kept hitting, kept hitting," as he says, in the Reds' organization, but was blocked at first base by Joey Votto. So he wasn't surprised to receive a call in December that he'd been traded. Call-ups in 2010 and '11 cost him ROY eligibility, but this is Alonso's first chance to make an impact.
STAR ON THE RISE
DEXTER FOWLER, ROCKIES
Called Snakeskin by Troy Tulowitzki for his lack of body fat, Fowler, 26, added 12 pounds of muscle over the off-season. That should help the centerfielder—who didn't start switch-hitting until he became a pro and who was rushed to the big leagues from Double A in 2008—come into his own at the plate.
STAR IN DECLINE
TODD HELTON, ROCKIES
The team values the 38-year-old for his ability to get on base (.385 OBP in 2011) and to grind out at bats. But his days as a premier slugger are behind him, says G.M. Dan O'Dowd. "The key with Todd is to understand the utilization of rest and recovery," he says. "It might be 100 games started, it might be 110."